206 



5- C. Olfersianus, Kunth. Umbel very simple, I to few- 

 rayed ; heads composed of few straw-colored spikelets ; achenium 

 oblong, its surface marked with quadrate cells ; otherwise re- 

 sembling C. flavescens. Plaquemines Co., La., (A. B. Langlois, 

 1882); Mexico, West Indies and eastern South America. 



6. C. polystachyiis, Rottb. New Orleans, (Torrey Herba- 

 rium ; an old specimen.) Widely distributed in tropical regions, 



Var, leptostachyus, Bceckl. {C. niicrodontiis, and C. 

 Gatesii, Torrey, C. Texensis, Steud.) Virginia to Florida (Cur- 

 tiss, N. A. Plants, No. 3049, part), and Texas, (E. Hall, 6^6^ 



7. C. leucolepis, Carey, MS., fide Clarke 1. c, p. 61, (not 

 of Boeckl. ; C. divergens, Chapm., not of HBK.) Quincy, Flor- 

 ida. Related to C. piimihcs, L., of India. 



8 C. unioloides, R. Br., var. bromoides, Clarke. Spikelets 

 much larger than in any of the foregoing species, straw-colored, 

 Cienaga, Los Angeles Co., Cal., (J. C. Oliver in Gray Herba- 

 rium) ; Mexico, West Indies and South America ; the type in 



Australia. 



* * Umbel compound. 



9. C. flavicomns, Vahl, Torrey, Ann. Lye, iii., 253, Boeck- 

 eler, not of Michaux, which, according to Mr. Clarke (1. c, p. 

 71), is C. strigosus, L. Virginia to Florida; also in Brazil. 



10. C. Hochstetteri, Nees. (C, flavicomus, Torrey, Bot. Mex. 

 Bound. Survey.) Glumes dark reddish brown ; achenium broadly 

 ellipsoidal, twice or three times the size of that of the foregoing 

 species, which it otherwise resembles. Louisiana (Hale) ; Texas 

 and New Mexico (C. Wright, No. 1965) ; also in tropical Amer- 

 ica, Australia, India and Africa, 



(B) Sub genus JUNCELLUS, Griseb. 



11. C. IcBvigatiis, L. Southern California (Brewer, Lem- 

 mon, Wright, Parish, No. 1050.) Widely distributed in tropical 



regions. 



(C) Sub-genus EUCYPERUS, Clarke, 



Section i. Aristati, Kunth, 

 * Spikelets digitate. 



12. C. amabilis, Vahl. (C aureus, aurantiacus and oligo^ 

 stachyus, HBK; C. glareosus,\-A€b'Ci\?) Sanoita Valley, south 

 crn Arizona, (Rothrock, No. 599, in Expl, and Surveys West of 



